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curl/docs/cmdline-opts/preproxy.md
Viktor Szakats 1fb734bc2d
docs: tidy-up scheme references 
After this patch `://` schemes are lowercase and enclosed in backticks.

Also:
- docs/libcurl/libcurl-multi.md: drop a stray C code fence.
- docs/libcurl/libcurl-tutorial.md: replace single/double quotes with
  Markdown markup where applicable.

Ref: #21646

Closes #21674
2026-05-19 16:55:45 +02:00

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c SPDX-License-Identifier Long Arg Help Added Category Multi See-also Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl preproxy <[protocol://]host[:port]> Use this proxy first 7.52.0 proxy single
proxy
socks5
--preproxy socks5://proxy.example -x http://http.example $URL

--preproxy

Use the specified SOCKS proxy before connecting to an HTTP or HTTPS --proxy. In such a case curl first connects to the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS proxy. Hence pre proxy.

The pre proxy string should be specified with a protocol:// prefix to specify alternative proxy protocols. Use socks4://, socks4a://, socks5:// or socks5h:// to request the specific SOCKS version to be used. No protocol specified makes curl default to SOCKS4.

If the port number is not specified in the proxy string, it is assumed to be 1080.

User and password that might be provided in the proxy string are URL decoded by curl. This allows you to pass in special characters such as @ by using %40 or pass in a colon with %3a.